List of top Chemistry Questions

The reaction between p-methyl benzaldehyde and conc. NaOH is an example of
In which of the following changes entropy decreases.
What is the structure of thiosulphuric acid?
Which of the following compounds reacts immediately with Lucas reagent?
Omega-3 fatty acid is present in
For a complex, $MX_3Y_3$ possessing trigonal prismatic geometry, the number of possible isomer is
Which of the following is correct regarding bond angles? (i) $SO_2 < H_2O$ $\quad\quad$ (ii) $H_2S < SO_2$ (iii) $SO_2 < H_2S \quad\quad (iv) SbH_3 < NO_2^+$
Which of the following pairs have different hybridisation and same shape? (i) $NO_3^-$ and $CO_3^{2-} $$\quad\quad$ (ii) $SO_2$ and $NH_2^-$ (iii) $XeF_2$ and $CO_2$ $\quad\quad$ (iv) $H_2O$ and $NH_3$
Which process is used in smelting during metallurgy of copper?
What colour is observed when $ZnO$ is heated?
Wavelength of a particular transition for $H\, atom$ is $400 \,nm$. What can be the wavelength of $He^+$ for the same transition?
Two separate bulbs contain gas A and gas B. The density of gas A is twice as that of B. The molecular mass of A is half as that of B. If temperature is constant, the ratio of the pressure of A and B is
The wave nature of electron was first experimentally verified by
The three types of expansion that takes place in solid are
The normality of 10% $H_2SO_4$ solution having density 1.1 g/cc is
The correct order of reactivity in S1 reaction for the following compounds is
Osmotic pressure of 0.4% urea solution is 1.64 atm and that of 3.42% cane sugar is 2.46 atm. When the above two solutions are mixed, the osmotic pressure of the resulting solution is:
Of the following, which species is primarily obtained in a solution containing $ KHF_2 $ ?
No work is done on the system, but $ q $ amount of heat is taken out from the system and given to the surroundings. Express the change in internal energy $ (\Delta U) $ of this system and what type of wall does the system have ?
Methemoglobinemia is caused due to the presence of in excess of which of the following in drinking water?
$KMnO_4$ on reaction with KOH does not give
In van der Waals equation at constant temperature 300 K, if a = 1.4 atm L mol, V = 100 mL, n = 1 mole, then what is the pressure of the gas?
In acidic medium, which of the following becomes colourless?
Gas in a cylinder is maintained at $10 \,atm$ pressure and $300\, K$ temperature. The cylinder will explode if pressure of gas goes beyond $15\, atm$. What is the maximum temperature to which gas can be heated?
F-centre is